Joshua Martinez flies a kite Thursday in his aunt's yard on East Avenue P across from the Valero Houston Refinery. Revised federal environmental rules aim to clear the air the 6-year-old's kite soars through.

Joshua Martinez flies a kite Thursday in his aunt's yard on East...

New federal rules would force oil refiners to adopt more aggressive measures for reducing hazardous air pollution, including the first mandatory monitoring of their fence lines for cancer-causing benzene.

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